Protesters gather at College and Bay Steets. (Nazima Walji/CBC)

By Your Voice Team, CBC News

Another large, noisy, traffic-stopping protest erupted in downtown Toronto on Monday afternoon, in reaction to what demonstrators called police overreaction during weekend G20 protests.

About 1,000 people gathered on College Street, outside the headquarters of the Toronto Police Service, chanting, drumming, and calling for the release of those protesters still being held in detention.

The protest has closed a section of the street over the dinner hour, affecting car and pedestrian traffic, as well as one of the city's busiest streetcar lines.

Here's a look at the protest, in photos:

Protesters sing, "What do we do when under attack, what do we do, stand up, fight back." (Nazima Walji/CBC)

Activist Naomi Klein takes part in the rally. (Patrick Morell/CBC)

Protesters use signs to get their message across. (Nazima Walji/CBC)